| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package nmcoap |
| |
| import ( |
| "fmt" |
| "sync" |
| |
| "github.com/runtimeco/go-coap" |
| log "github.com/sirupsen/logrus" |
| |
| "mynewt.apache.org/newtmgr/nmxact/nmxutil" |
| ) |
| |
| // The dispatcher is the owner of the listeners it points to. Only the |
| // dispatcher writes to these listeners. |
| type Dispatcher struct { |
| listeners []*Listener |
| rxer Receiver |
| logDepth int |
| mtx sync.Mutex |
| } |
| |
| func NewDispatcher(isTcp bool, logDepth int) *Dispatcher { |
| d := &Dispatcher{ |
| rxer: NewReceiver(isTcp), |
| logDepth: logDepth + 2, |
| } |
| |
| return d |
| } |
| |
| func (d *Dispatcher) findListenerIdx(mc MsgCriteria) int { |
| for i, lner := range d.listeners { |
| if CompareMsgCriteria(lner.Criteria, mc) == 0 { |
| return i |
| } |
| } |
| |
| return -1 |
| } |
| |
| func (d *Dispatcher) matchListener(mc MsgCriteria) *Listener { |
| for _, lner := range d.listeners { |
| if MatchMsgCriteria(lner.Criteria, mc) { |
| return lner |
| } |
| } |
| |
| return nil |
| } |
| |
| func (d *Dispatcher) AddListener(mc MsgCriteria) (*Listener, error) { |
| nmxutil.LogAddCoapListener(d.logDepth, mc.String()) |
| |
| d.mtx.Lock() |
| defer d.mtx.Unlock() |
| |
| if idx := d.findListenerIdx(mc); idx != -1 { |
| return nil, fmt.Errorf("duplicate CoAP listener: %s", mc.String()) |
| } |
| |
| lner := NewListener(mc) |
| d.listeners = append(d.listeners, lner) |
| SortListeners(d.listeners) |
| |
| return lner, nil |
| } |
| |
| func (d *Dispatcher) RemoveListener(mc MsgCriteria) *Listener { |
| d.mtx.Lock() |
| defer d.mtx.Unlock() |
| |
| idx := d.findListenerIdx(mc) |
| if idx == -1 { |
| return nil |
| } |
| lner := d.listeners[idx] |
| |
| d.listeners = append(d.listeners[:idx], d.listeners[idx+1:]...) |
| |
| nmxutil.LogRemoveCoapListener(d.logDepth, mc.String()) |
| lner.Close() |
| |
| return lner |
| } |
| |
| // Returns true if the response was dispatched. |
| func (d *Dispatcher) Dispatch(data []byte) bool { |
| // See if this fragment completes a packet. |
| msg := d.rxer.Rx(data) |
| if msg == nil { |
| return false |
| } |
| |
| d.mtx.Lock() |
| defer d.mtx.Unlock() |
| |
| mc := CriteriaFromMsg(msg) |
| lner := d.matchListener(mc) |
| if lner == nil { |
| log.Debugf("no listener for incoming CoAP message: %s", mc.String()) |
| return false |
| } |
| |
| lner.RspChan <- msg |
| return true |
| } |
| |
| func (d *Dispatcher) ProcessCoapReq(data []byte) (coap.Message, error) { |
| m := d.rxer.Rx(data) |
| if m == nil { |
| return nil, nil |
| } |
| return m, nil |
| } |
| |
| func (d *Dispatcher) ErrorOne(mc MsgCriteria, err error) error { |
| d.mtx.Lock() |
| defer d.mtx.Unlock() |
| |
| lner := d.matchListener(mc) |
| if lner == nil { |
| return fmt.Errorf("no CoAP listener: %s", mc.String()) |
| } |
| |
| lner.ErrChan <- err |
| |
| return nil |
| } |
| |
| func (d *Dispatcher) ErrorAll(err error) { |
| d.mtx.Lock() |
| defer d.mtx.Unlock() |
| |
| for _, lner := range d.listeners { |
| lner.ErrChan <- err |
| } |
| } |